125 lines
3 KiB
C
125 lines
3 KiB
C
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/*
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* Faraday FTRTC010 Real Time Clock
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*
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* (C) Copyright 2009 Faraday Technology
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* Po-Yu Chuang <ratbert@faraday-tech.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <common.h>
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#include <rtc.h>
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#include <asm/io.h>
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struct ftrtc010 {
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unsigned int sec; /* 0x00 */
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unsigned int min; /* 0x04 */
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unsigned int hour; /* 0x08 */
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unsigned int day; /* 0x0c */
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unsigned int alarm_sec; /* 0x10 */
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unsigned int alarm_min; /* 0x14 */
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unsigned int alarm_hour; /* 0x18 */
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unsigned int record; /* 0x1c */
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unsigned int cr; /* 0x20 */
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};
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/*
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* RTC Control Register
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*/
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#define FTRTC010_CR_ENABLE (1 << 0)
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#define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */
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#define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */
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#define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */
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#define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */
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static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
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static void ftrtc010_enable(void)
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{
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writel(FTRTC010_CR_ENABLE, &rtc->cr);
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}
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/*
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* return current time in seconds
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*/
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static unsigned long ftrtc010_time(void)
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{
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unsigned long day;
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unsigned long hour;
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unsigned long minute;
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unsigned long second;
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unsigned long second2;
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do {
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second = readl(&rtc->sec);
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day = readl(&rtc->day);
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hour = readl(&rtc->hour);
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minute = readl(&rtc->min);
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second2 = readl(&rtc->sec);
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} while (second != second2);
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return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
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}
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/*
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* Get the current time from the RTC
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*/
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int rtc_get(struct rtc_time *tmp)
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{
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unsigned long now;
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debug("%s(): record register: %x\n",
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__func__, readl(&rtc->record));
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now = ftrtc010_time() + readl(&rtc->record);
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to_tm(now, tmp);
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return 0;
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}
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/*
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* Set the RTC
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*/
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int rtc_set(struct rtc_time *tmp)
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{
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unsigned long new;
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unsigned long now;
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debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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__func__,
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
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tmp->tm_min, tmp->tm_sec);
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now = ftrtc010_time();
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debug("%s(): write %lx to record register\n", __func__, new - now);
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writel(new - now, &rtc->record);
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return 0;
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}
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void rtc_reset(void)
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{
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debug("%s()\n", __func__);
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ftrtc010_enable();
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}
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